Thank you for your time, EnGarde.It'll increase your chances alot, but like all statistics, there are some that have better than average chances, and some that have worse. A lot worse. For example, my personal shiny chance as of right now is >1:2k eggs, which is really really bad, especially since I also have the shiny charm. :-/
To add salt to the wound, my wild encounter shiny chances are really really high. I've caught like 3 shiny hoppip, a psyduck, spritzee, illumise, phantump, mincinno, beautifly, and just yesterday, a scraggy. The scraggy is actually kinda cool, since she actually had the HA (which, in a horde battle, is kinda rare). Too bad she was modest.
To add more salt to the wound, my chances of finding a shiny through wonder trade is currently higher than through MM breeding, since I have gotten 3 shinies that way (a zubat, eevee, and cresselia), and I think, globally, I've WT'ed maybe about 150-200 pokemon.
Btw, if you see any pokemon on my thread that you want, let me know and I'll be glad to give some of my pokemon in return for helping me to complete my pokedex. ;)